Verified answer

Answer:

(a - b)(a - b - 2c)

Step-by-step explanation:

a^2 + b^2 + 2bc - 2ca - 2ab =

=(a^2 - + b^2) + 2bc - 2ca then

= (a - b)^2 - 2c(a - b)

=(a - b)[(a - b) - 2c)]

=(a - b)(a - b - 2c)

Hence , the answer is =(a - b)(a - b - 2c)

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